Piston head for hydraulic injection molding machine

Abstract

A piston head of a hydraulic injection molding machine is screwed with a tie rod inside a hydraulic cylinder of the hydraulic injection molding machine. The piston head has a second screw formed in an inner circumference of a hollow of the piston head and engaged with a first screw formed in an outer circumference of the tie rod. An insert groove having a predetermined shape is formed in the inner circumference of the piston head in front of the second screw.

1. A piston head of a hydraulic injection molding machine, which is screwed with a tie rod inside a hydraulic cylinder of the hydraulic injection molding machine,
 wherein the piston head has a second screw formed in an inner circumference of a hollow of the piston head and engaged with a first screw formed in an outer circumference of the tie rod, and an insert groove having a predetermined shape is formed in the inner circumference of the piston head in front of the second screw, 
 wherein the insert groove is formed in a circumferential direction of the inner circumference, and 
 wherein the insert groove is formed between the second screw and an oil sealing unit that prevents inflow of oil. 
 
     
     
       2. A piston head of a hydraulic injection molding machine, which is screwed with a tie rod inside a hydraulic cylinder of the hydraulic injection molding machine,
 wherein the piston head has a second screw formed in an inner circumference of a hollow of the piston head and engaged with a first screw formed in an outer circumference of the tie rod, and an insert groove having a predetermined shape is formed in the inner circumference of the piston head in front of the second screw, 
 wherein the insert groove is formed to be inclined toward the rear of the piston head. 
 
     
     
       3. A piston head of a hydraulic injection molding machine, which is screwed with a tie rod inside a hydraulic cylinder of the hydraulic injection molding machine,
 wherein the piston head has a second screw formed in an inner circumference of a hollow of the piston head and engaged with a first screw formed in an outer circumference of the tie rod, and an insert groove having a predetermined shape is formed in the inner circumference of the piston head in front of the second screw, 
 wherein the insert groove is formed to a predetermined depth perpendicularly to the inner circumference and then bent toward the rear of the piston head.